Do they backlink them? Because they won't be super helpful without any backlinks, unless it is for expired 2.0s.
Are the articles unique, handwritten, or spun?
Couple good tutorials on here, just search the forums, depending on what type you want.
What tier do you want these for?

If you're gonna order from Fiverr or SEOClerk, order one just to test out on a random website of yours that you don't care about. I recently ordered on SEOClerks. Seller said he does everything manually, HAND WRITTEN content and will make 10 of web 20. What I got was a fucking joke. Spun content, not even close to being unique. Links all on the same place and same keyword, same usernames, same emails... His service is a fucking joke, nothing else. So, order some to not so important website to see how it goes first.

I've just built 10 web 2.0s, including 4 expired tumblr's. I bought 12 pbn links from two sellers on fiverr for tier 2 backlinks on the wordpress web 2.0s, the tumblr's have loads of backlinks on them, plus I'm doing manual blog comments and adding them to stumbleupon, flipboard and scoop it. All original content on the web 2.0s written by me, around 6 to 10 articles on each one and increasing. I've seen a rise of 25 to 30 places in a week, 5 keywords were around 50 now 25, but no movement in the last few days. 7 are complete, with 3 just started on, guess I should build some more and add more backlinks to them...

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